<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/vue.js"></script>
</head>
<body>
    <!-- 准备一个容器 -->
    <div id="root">
        <h2>今天天气很{{weather}}</h2>
        <!--绑定事件的时候：@xxx="yyy"可以写一些简单的语句-->
        <!--<button @click="isHot = !isHot">切换天气</button>-->
        <button @click="changeWeather">切换天气</button>
    </div>
</body>
    <script>
        const vm = new Vue({
            el:'#root',
            data:{
                isHot:true
            },
            computed:{
                weather() {
                    return this.isHot ? "炎热" : "凉爽"
                }
            },
            methods: {
                changeWeather() {
                    this.isHot = !this.isHot
                }   
            }
        })
    </script>
</html>